Variables in nested Foreach-Object and Where-Object

Question

I'm wondering how to work with nested Forach-Object, Where-Object and other Cmdlets in Powershell. For example this code:

$obj1 | Foreach-Object {      $obj2 | Where-Object { $_ .... } } 

So in the code block of Foreach-Object I use the elements of $obj1 as $_. But the same happenn in the code block of Where-Object with $obj2. So how can I access both objects elements in the Where-Object code block? I would have to do $_.Arg1 -eq $_.Arg1 but this makes no sense.

Answer 1

Another way do address this is with a slighty different foreach

ForEach($item in $obj1){     $obj | Where-Object{$_.arg -eq $item.arg} } 

Still boils down to about_Scopes. $_ is always a reference to the current scope. As you must know ($_.Arg1 -eq $_.Arg1) would just be refering to itself.

Answer 2

afaik, You'll need to keep a reference to the outer loop by putting it in a local variable.

$obj1 | Foreach-Object {      $myobj1 = $_     $obj2 | Where-Object { $_ .... } }